Please pull out the plectrum before push the button
Flash modes: 3 flashing modes. Push the button once,it will constant on;twice for fast flash and three times for slow flash.
Battery: 30 hours for constant light and 60-80 hours for flash light.Each shoelace use a CR2032 button cell. You can replace the battery yourself.
Suitable for:skating,outdoor sport,night running,party,dancing